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Kurunegala, nestled in the North Western Province of Sri Lanka, occupies a strategically important position within the island’s interior. Located at approximately 7.48°N, 80.37°E, the city sits at an elevation of roughly 120 meters (394 feet) above sea level, contributing to a relatively mild climate compared to coastal regions. The surrounding landscape is a blend of gently undulating plains and pockets of rocky terrain, characteristic of the Rajanpur plateau. This area transitions from dense agricultural lands – primarily rice paddies and coconut plantations – to drier scrubland further afield. The city’s urban footprint is relatively compact, exhibiting a clear urban–rural gradient as one moves outwards. While Kurunegala itself is a growing urban centre, it’s surrounded by numerous smaller villages and agricultural communities, creating a mosaic of land use. The proximity to the Kurunegala tank (reservoir) influences local microclimates, potentially leading to increased humidity and localized fog formation. Industrially, Kurunegala is not a major hub, but smaller-scale manufacturing and processing facilities related to agriculture (e.g., coconut oil extraction) are present. The prevailing winds generally flow from the southwest, influenced by the monsoon patterns, which significantly impact the dispersal of any pollutants generated within the city and surrounding areas. The terrain, while not mountainous, can still create localized areas of stagnant air, particularly during periods of low wind speed, potentially trapping pollutants and impacting air quality. The city’s location inland, away from direct coastal breezes, means it is more susceptible to the accumulation of pollutants from regional sources.

Kurunegala’s air quality experiences a distinct seasonal pattern dictated by Sri Lanka’s monsoon climate. The inter-monsoon season (March-May) often presents the most challenging conditions. Hot, dry winds prevail, and temperature inversions are more frequent, trapping pollutants close to the ground. Agricultural burning, a common practice for land clearing and residue disposal, intensifies during this period, contributing significantly to particulate matter. The southwest monsoon (June-September) brings relief with increased rainfall and stronger winds, effectively flushing out accumulated pollutants and improving air quality. However, heavy rainfall can also lead to increased humidity and the release of biogenic volatile organic compounds (BVOCs) from vegetation, which can react with other pollutants to form ozone. The northeast monsoon (October-January) is generally milder than the southwest monsoon, with less intense rainfall and more stable atmospheric conditions. Fog, particularly in the early morning hours, is common during this season, reducing visibility and potentially trapping pollutants. February is typically a transitional month, with decreasing rainfall and increasing temperatures, often leading to a gradual deterioration in air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the inter-monsoon season and periods of fog. Outdoor activities are best planned for the monsoon months when air quality is generally better. Agricultural workers should be particularly mindful of smoke exposure during the dry season, utilizing appropriate protective measures.